By the time Philip Glass wrote the music on this CD; Music for Voices in 1970, and Another Look at Harmony, Part 4 in 1970-1975, he had already established his voice as one of the main architects of the minimalist music movement. Though he disparages the term, minimalist, he has accepted the classification, but with the distinction that it only applies only to his earliest pieces, those up to and including Music in Twelve Parts.